variable reduction

Finally, group classification of a generalized KP equation is undertaken. Group invariant solutions of the equation are obtained by combining the symmetry reduction method with the variable coefficient generalized Tanh method.

另外，我们还给出了广义Kadomtsev-Petviashvili方程的古典对称群分类，并结合变系数广义Tanh函数方法获得了其群不变解。

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Development of variable speed coupler reduction box for drilling machine in oil-field "Technical specifications of springs for fuel pump, governor and injecter of diesel engines"

油田钻机用调速型偶合器减速箱的研制GB/T2940-1982柴油机用喷油泵、调速器、喷油器弹簧技术条件

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Geared turbine drive Development of variable speed coupler reduction box for drilling machine in oil-field

涡轮机减速齿轮传动油田钻机用调速型偶合器减速箱的研制

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By means of variable substitution and iterative method, this paper puts forth some new higher-order differential equations, and gives their formula of reduction of integrals to common denominator.

借助变量代换、迭代等方法，提出几类新的高阶常微分方程，给出其相应的通积分公式。

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The equivalence among classification , relative positive-region and variable precision rough sets, attributes reduction becomes multiform.

并且三者之间打破了在经典粗糙集模型中的等价性,需要针对三者分别建立模型, 使属性约简变得多样化.

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